Robert T. Clausen

1911

• A botanical study of the yam beans (Pachyrrhizus)
• A monograph of the Ophioglossaceae
• A new species of Najas from the Hudson River
• Biennial species of Sedum of the Sierra Madre Occidental and Mexican Plateau
• Carex aestivalis and Carex lurida var. gracilis on the glaciated Allegheny plateau
• Contributions to the flora of New Jersey
• Hybrids of the eastern North American subspecies of Lycopodium complanatum and L. tristachyum
• Najas arguta in Central America and its Relationship to N. wrightiana
• Nomenclatural changes and innovations in the Crassulaceae
• Northeastern limits of the known range of Rhus toxicodendren
• On the status of Botrychium dissectum var. oneidense
• Ophioglossum petiolatum Hooker